Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3a2f5f8f06a08d…

MALICIOUS

PDF

70.7 KB Created: 2021-07-23 01:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96dd13ad8ad84b74aa5a2025f70cbeff SHA-1: c5b3ea2cbad9a404f879f30ec4c511cf6c1a0c24 SHA-256: ac3a2f5f8f06a08db1b49b30b9252e4439da825cb229d06a2e696783a8e7e89b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, with many distinct hosts, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9548

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cathyourhair.nl/js/ckfinder/userfiles/files/85317604169.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c213b5173fb---titoxo.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/2893309004.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf634c142---62578297176.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/5694111572.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jk12e6rr0epivqu4nkphc3pfa4/6568041657.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4f3a83366cc39d680db72491206ee132/43188413672.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ks40221kbv2ntk5uqgn39aivj1/zarapovob.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4bf815b8a4d7bb37e6b00b3850cfa6c4/lilutorovodugub.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/adb172d3d731c371812ae8762f96fe1e/lixuredejesazutubedukeror.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0613a4e80a---44231668289.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0427cbfc36a25681713ff3bea33542b0/254593397.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427e93d170---85554750539.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088328420617---suwuzuwenof.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/68e7afb783940f4f00b6240a886b9217/zorivojefogazigim.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/tipora.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c18e958431---liresefaj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb81096f958---51056235970.pdfIn PDF document text
    • https://landi-bg.com/images/file/69122036627.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd088782bf---23976316259.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/39301165398.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160849756bff5d---865250989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=commentary+on+canon+lawPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10364 bytes
SHA-256: 29314a342a01d72c0f923be75801ef2097e2b3e414c72846cd6e32faedca72f9